Abstract
The present paper investigates the influence of chip disposability, hole dimension, cutting force, tool life and production cost when a plain medium carbon steel is drilled by either a coated carbide drill or a high-speed steel drill without any cutting fluid. Wet machining can be replaced by dry one as far as dimensional accuracy is not a crucial factor. Although the elimination of the cutting fluid shortens tool life, the increase of production cost is small. Considering all the factors, it is possible to carry out dry drilling with through- when the aspect ratio is within two.
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